A radioactive element \( X \) converts into another stable element ...

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A radioactive element \( X \) converts into another stable element \( Y \). Half life of \( X \) is 2 hrs. Initially only \( X \) is present. After
P time \( t \), the ratio of atoms of \( X \) and \( Y \) is found to be \( 1: 4 \), then \( t \) in

W hours is :
(A) 2
(B) 4
(D) 6
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